[Milsurplus] G11 Dioede

[Bob kb8tq]

Hi

If it is like the “usual circuits” the diodes are handling < 30V switching signals. The matching 
diode to diode is not as big a deal as leakage. Germanium was not a superstar in that respect. 
Going to a rectifier diode likely will get you in trouble with capacitance. A 914 or 4148 is a 
reasonable choice. If it does not work, try something else …

I would swap out one entire stage and see what happens.

Bob

> On Dec 2, 2017, at 12:24 PM, Ray Fantini <RAFANTINI at salisbury.edu> wrote:
> 
> Ok so working on this FR38B/U frequency counter and running into an issue. They use lots of early Germanium diodes to trigger and provide faster switching times in most of the vacuum tube stages.  They have a part number of 212-G11A but I have not been able to find any information on them. Was thinking of replacing a lot of the week performing ones with 1N914 switching diodes but am a little concerned about voltage rating  but have to assume that the late fifties first generation G11 has to be a lower voltage ratting then a modern silicone diode?
> There is a panel that originally had a dozen diodes as spares in the unit but someone stole or used those years ago. They must have been a high failure rate device.
> 
> Ray F/KA3EKH
>  
>  
> 
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